text: /* Store a character in UTF-8 string.
     Copyright (C) 2002, 2005-2006, 2009-2015 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2002.
  
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #if defined IN_LIBUNISTRING
  /* Tell unistr.h to declare u8_uctomb as 'extern', not 'static inline'.  */
  # include "unistring-notinline.h"
  #endif
  
  /* Specification.  */
  #include "unistr.h"
  
  #if !HAVE_INLINE
  
  int
  u8_uctomb (uint8_t *s, ucs4_t uc, int n)
  {
    if (uc < 0x80)
      {
        if (n > 0)
          {
            s[0] = uc;
            return 1;
          }
        /* else return -2, below.  */
      }
    else
      {
        int count;
  
        if (uc < 0x800)
          count = 2;
        else if (uc < 0x10000)
          {
            if (uc < 0xd800 || uc >= 0xe000)
              count = 3;
            else
              return -1;
          }
  #if 0
        else if (uc < 0x200000)
          count = 4;
        else if (uc < 0x4000000)
          count = 5;
        else if (uc <= 0x7fffffff)
          count = 6;
  #else
        else if (uc < 0x110000)
          count = 4;
  #endif
        else
          return -1;
  
        if (n >= count)
          {
            switch (count) /* note: code falls through cases! */
              {
  #if 0
              case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
              case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
  #endif
              case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
              case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
              case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
            /*case 1:*/ s[0] = uc;
              }
            return count;
          }
      }
    return -2;
  }
  
  #endif
  